TWI629385B - Composite fiber and method for forming the same - Google Patents

Abstract

The present disclosure provides a composite fiber comprising: a first region, the composition of the first region comprising a colorant and a resin; and a second region, the component of the second region comprising a crosslinked thermoplastic polymer, wherein the crosslinking The thermoplastic polymer is a colloidal particle having an average particle diameter of not more than 1000 nm. The present disclosure also provides a method of manufacturing a composite fiber.

Description

Composite fiber and manufacturing method thereof

The present disclosure relates to a composite fiber and a method of manufacturing the same.

In the textile fiber industry, polyamine (nylon), polyester, and polyolefin products are numerous. However, since these materials are hydrophobic, the fiber products have disadvantages such as no moisture absorption and no water absorption. In order to improve the above disadvantages, in the past, a hydrophobic polymer such as polyester and a hydrophilic polymer such as an ethylene-vinyl alcohol copolymer (EVOH) were used for composite spinning to form a core-sheath type composite. Fiber to improve the hydrophilic properties of polyester fibers.

However, after the composite spinning of materials having different hydrophilicity and hydrophobicity, the interface between the two materials is small, so there is often a separation phenomenon, which causes problems such as breakage during post-processing and affecting the appearance of the work or the fluffing of the finished product. In addition, the composite fiber formed by the polyester and the ethylene-vinyl alcohol copolymer is in the stage of textile dyeing, and the ethylene-vinyl alcohol copolymer (EVOH) of the fiber surface layer is often swelled and dissolved between fibers due to its low melting point and softening point. The stickiness phenomenon occurs, resulting in a problem of poor hand feel of the finished fabric.

Therefore, there is an urgent need for an improved composite fiber material and its process to solve the above problems.

According to an embodiment, the present disclosure provides a composite fiber comprising: a first region, the composition of the first region comprising a resin; and a second region, the component of the second region comprising a crosslinked thermoplastic polymer, wherein the crosslinked thermoplastic polymer comprises an average particle size of not more than 1000 nm colloidal particles. Or according to another embodiment, the composition of the first region further comprises a colorant.

According to another embodiment, the present disclosure provides a method for manufacturing a composite fiber, comprising: mixing 96-99.99% by weight of a thermoplastic polymer, 0.1 to 1.5% by weight of a crosslinking agent, and 0.1 to 1.5% by weight of a dispersing agent to form a composite fiber. Mixing; adding 0.01~1wt% of crosslinking initiator to the mixture and kneading to form a crosslinked thermoplastic polymer; crosslinking and granulating the crosslinked thermoplastic polymer to form a crosslinked modified particle And a composite melt spinning of the crosslinked modified particles with a resin, wherein the resin may or may not contain a colorant.

The above and other objects, features, and advantages of the present invention will become more apparent and understood.

A‧‧‧First area

B‧‧‧Second area

200‧‧‧ method

202-208‧‧‧Steps

1A-1E are schematic cross-sectional views showing composite fibers in accordance with some embodiments of the present disclosure.

2 is a flow chart showing a method of manufacturing a composite fiber according to an embodiment of the present disclosure.

3A, 3B are cross-sectional SEM images showing cross-sections of composite fibers in accordance with an embodiment of the present disclosure.

4A, 4B are cross-sectional scanning electron micrographs showing composite fibers in accordance with an embodiment of the present disclosure.

Figures 5-9 are cross-sectional scanning electron micrographs showing composite fibers in accordance with some embodiments of the present disclosure.

Several different embodiments are set forth below in light of the different features disclosed herein. The specific elements and arrangements in the disclosure are intended to be simplified, but the disclosure is not limited to the embodiments. For example, a description of forming a first element on a second element can include an embodiment in which the first element is in direct contact with the second element, and also includes having additional elements formed between the first element and the second element such that An embodiment in which one element is not in direct contact with the second element. In addition, for the sake of brevity, the disclosure is represented by repeated element symbols and/or letters in different examples, but does not represent a particular relationship between the various embodiments and/or structures.

The present disclosure provides a composite fiber which can improve cross-linking modification of a hydrophilic thermoplastic polymer, thereby improving the interfacial separation phenomenon between the hydrophilic and hydrophobic materials, thereby alleviating the problem that the fiber is broken after the fiber is processed, or the appearance of the finished product is damaged. Through the method for manufacturing the composite fiber provided by the disclosed embodiments, the composite fiber can be solved in the textile dyeing stage, and the thermoplastic polymer such as ethylene-vinyl alcohol copolymer (EVOH) of the fiber surface layer is swelled and interfiber viscous. The problem of the finished fabric is not good.

The disclosed embodiments use a trifunctional crosslinking agent to crosslink and modify a hydrophilic thermoplastic polymer, and then cross-link the crosslinked hydrophilic thermoplastic polymer with a hydrophobic resin to pass through a hydrophilic thermoplastic polymerization. The cross-linking modification of the material can improve the separation of the interface between the two materials. Further, the hydrophobic resin of the present embodiment may be first mixed with a colorant and then composite-spun with a modified hydrophilic thermoplastic polymer to form a colored composite fiber. Implementation of the disclosure The colorant in the example can also be mixed with the resin in the step of composite spinning.

In an embodiment of the present disclosure, a composite fiber is provided. The composite fiber includes a first region A and a second region B.

In an embodiment of the present disclosure, the composition of the first region A includes a resin. In another embodiment of the present disclosure, the composition of the region A includes a colorant, and the weight percentage of the foregoing colorant in the composition of the first region A 12wt%. The foregoing colorant may include: an organic dye (dye), an inorganic pigment, an organic pigment, a special pigment such as a metal fragment, a fluorescent pigment, a pearlescent pigment, or the like, or a combination thereof. In one embodiment, the weight percentage of the foregoing colorant in the composition of the first region A 8wt%. The foregoing resin may be a hydrophobic resin, and includes, for example, a polyester resin, a polyamide resin, a polyolefin resin, or a copolymer of the foregoing various types of resins. In an embodiment, the polyester resin may include polyethylene terephthalate (PET), polybutylene terephthalate (PBT), or a combination thereof.

In an embodiment of the present disclosure, the composition of the second region B comprises crosslinking one of the thermoplastic polymers. The aforementioned thermoplastic polymer may be a hydrophilic thermoplastic polymer such as ethylene-vinyl alcohol copolymer (EVOH). In some embodiments, the ethylene-vinyl alcohol copolymer (EVOH) may have a vinyl mole percentage of from 25 to 50%; in some embodiments, the ethylene-vinyl alcohol copolymer may have a vinyl mole percentage of from 35 to 45%. . It should be noted here that if the average particle size of the insoluble colloidal particles produced after the crosslinking reaction is too large, the molding process of the fibers may be hindered. However, in the disclosed embodiment, in the second region B The average particle size of the colloidal particles produced in the composition may be 1000 nm, up to the current commercial fiber spinnable standard; that is, the crosslinked thermoplastic polymer in the second region B comprises colloidal particles having an average particle diameter of not more than 1000 nm. In some embodiments, the average particle size of the colloidal particles produced within the composition of the second region B can be 500 nm; in one embodiment, the average particle size of the colloidal particles produced in the composition of the second region B may be 350 nm; in one embodiment, the average particle size of the colloidal particles produced in the composition of the second region B may be 200nm.

In one embodiment, the composition of the second region B is from 96 to 99.79 wt% of the thermoplastic polymer, from 0.1 to 1.5 wt% of the crosslinker, from 0.1 to 1.5 wt% of the dispersant, and from 0.01 to 1 wt%. Formed with a combination of initiators.

In some embodiments, the thermoplastic polymer can comprise about 96.0, 96.5, 97.0, 97.5, 98.0, 98.5, 99.0, 99.5, or 99.79% by weight of the component of the second region B. The thermoplastic polymer can be a hydrophilic thermoplastic polymer such as ethylene vinyl alcohol copolymer (EVOH). In some embodiments, the ethylene-vinyl alcohol copolymer (EVOH) may have a vinyl mole percentage of, for example, 25 to 50%, or 35 to 45%.

In some embodiments, the crosslinking agent may comprise about 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.3 by weight of the components of the second region B. , 1.4 or 1.5 wt%. In some embodiments, the crosslinking agent can include a tripropenyl ester compound, a tripropylene amine compound, or a combination of the foregoing. For example, the tripropenyl ester compound may include: triallyl isocynaurate (TAIC), triallyl cyanurate (TAC), and tricresyl trimellitate. (triallyl trimesate; TAM), or a combination of the foregoing. For example, the tripropyleneamine compound may include: triallyl amine, tripropylene melamine (triallyl-ammoniumcyanurate), or a combination of the foregoing.

In some embodiments, the dispersant may comprise from about 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, or 1.5 wt% of the weight of the second region B component. In some embodiments, the dispersing agent can include: a C _15-38 alkane, a C _15-38 ester, or a mixture of the foregoing. The addition of a dispersant contributes to the uniform dispersion of the components of the components of the second zone B. In detail, the addition of the dispersing agent allows the crosslinking agent itself to not agglomerate, further promoting the crosslinking reaction to function uniformly.

In some embodiments, the weight percent of the crosslinking initiator in the second region B component can be about 0.01, 0.05, 0.1, 0.2, 0.3, 0.4, 0.5, 1 wt%. In some embodiments, the crosslinking initiator can include: benzoyl peroxide, dicumyl peroxide, azobisisobutyronitrile, or a combination of the foregoing. The type of crosslinking initiator used will depend on the type of crosslinking agent used. The addition of the crosslinking initiator facilitates the progress of the crosslinking reaction.

After the crosslinking reaction, the shear force (melt viscosity (η) × shear rate) of the composition of the second region B at 190 to 220 ° C may be 120 to 20 Pa. s × 4000 ~ 12000s ^-1 .

The cross-linking modification of the hydrophilic thermoplastic polymer can improve the phenomenon of interfacial separation between the two materials, which is caused by the functional groups of the first region A and the second region B to generate virgin between the two materials. Valli. It should be noted that the van der Waals force generated between the above functional groups increases the interfacial adhesion between the first region A and the second region B, so that the first region A and the second region B have better bonding, improving the original The separation phenomenon of the interface makes the interface between the first area A and the second area B become inconspicuous. For example, if the first area A Both the resin used and the crosslinking agent used in the second region B component have a benzene ring structure, and the van der Waals force between the two regions is enhanced, thereby contributing to the relationship between the first region A and the second region B. link.

The composite fibers provided by the embodiments may include, but are not limited to, partially extended filament (POY), fully extended filament (FOY), spun filament (SDY), false twisted silk (DTY), or air processed silk (ATY). .

In a cross section of the composite fiber, the area ratio of the first region A to the second region B may be 10:90 to 90:10. In some embodiments, the area ratio of the first area A and the second area B may be 10:90, 20:80, 30:70, 40:60, 50:50, 60:40, 70:30, 80: 20, or 90:10. In one embodiment, at least a portion of the second region of the composite fiber is located at a periphery of the cross-section. In the cross-section of one of the composite fibers, as long as the second region B is located at the outer periphery of the cross-section, the protective function of the thermoplastic polymer cross-linked through the second region B can be achieved, thereby improving the rubbing fastness of the conventional chemical fiber. Poor, poor washing fastness and non-permanent moisture wicking. In one embodiment, in the cross section of the composite fiber, the first region A is a core and the second region B is a sheath.

1A to 1E are cross-sectional views showing the composite fiber provided by the present disclosure. Depending on the configuration of the first region A and the second region B in the cross section of the composite fiber, the type of the composite fiber may include: sheath/core, segment pie, or island-type (island- In-sea). For example, in some embodiments, the composite fiber can be a concentric sheath core fiber as shown in Figure 1A or an eccentric sheath core fiber as shown in Figure 1B. In other embodiments, the composite fibers may be split fibers as shown in Figures 1C and 1D. In other embodiments, the composite fiber may be an island-in-the-sea fiber as shown in Figure 1E. It should be noted that 1A to 1E are shown by way of example only and are not intended to limit the disclosure, as long as the second region B including the crosslinked thermoplastic polymer component in the composite fiber is disposed on the entire surface of the composite fiber, and can be used in the present disclosure. . For example, the number of divisions of the split fibers shown in FIGS. 1C and 1D and the number of islands of the sea-island fibers shown in FIG. 1E can be adjusted by those skilled in the art according to actual needs. Further, those skilled in the art can arbitrarily set the cross-sectional shape and diameter of the obtained composite fiber by the shape and size of the nozzle hole.

In another embodiment of the present disclosure, a method of making a composite fiber is provided. 2 is a flow chart showing a method of manufacturing a composite fiber 200 in accordance with an embodiment of the present disclosure. First, the method 200 proceeds to step 202 by mixing 96 to 99.79 wt% of the thermoplastic polymer, 0.1 to 1.5 wt% of the crosslinking agent, and 0.1 to 1.5 wt% of the dispersant to form a mixture. Next, proceeding to step 204, 0.01 to 1% by weight of a crosslinking initiator is added to the mixture and kneaded to form a crosslinked thermoplastic polymer. For the purpose of brevity, the types and functions of the thermoplastic polymer, the crosslinking agent, the dispersing agent, and the crosslinking initiator added in the method 200 can be referred to the aforementioned related paragraphs, and are not described herein.

In step 204, the kneading can be performed using, for example, a twin-screw kneader, or other suitable kneading machine. The screw rotation speed can be, for example, 200 to 300 rpm. The mixing time can be about 1 to 10 minutes, and the mixing temperature can be about 170 to 230 °C. In one embodiment, the time of the kneading can be about 10 minutes, and the temperature of the kneading can be about 200 to 230 °C. However, the process parameters of the above mixing may be adjusted according to actual needs, and are not limited thereto.

It should be noted that during the kneading process, the thermoplastic polymer will melt and the crosslinker will pass through its -C=C double bond functional group and melt. The thermoplastic polymer undergoes a crosslinking reaction to make the thermoplastic polymer a crosslinked thermoplastic polymer. By controlling the ratio of addition of the thermoplastic polymer to the crosslinking agent, the proportion of the crosslinked thermoplastic polymer in the integrally crosslinked thermoplastic polymer enables the crosslinked thermoplastic polymer to have flow characteristics. If the proportion of the crosslinking agent is too high, most of the thermoplastic polymer forms a network structure, which will cause the crosslinked thermoplastic polymer to lose fluidity and cannot be drawn into fibers. If the proportion of the crosslinking agent is too low and the proportion of the crosslinking reaction of the thermoplastic polymer is too low, the purpose of modifying the thermoplastic polymer cannot be achieved.

In step 204, the shearing force (melt viscosity (η) × shear rate) of the crosslinked thermoplastic polymer comprising the crosslinked thermoplastic polymer at 190 to 220 ° C may be 120 to 20 Pa. s × 4000~12000s ^-1 , and the average particle size of the colloidal particles which are insoluble in the crosslinked thermoplastic polymer is controlled to 1000nm, so as not to hinder the subsequent fiber forming process.

Next, the method 200 proceeds to step 206 where the crosslinked thermoplastic polymer is drawn and diced to form a crosslinked modified granulated product. The stranding and pelletizing steps can be carried out in accordance with the manner and conditions well known in the art.

Finally, method 200 proceeds to step 208 where the crosslinked modified granules are compound melt spun with a colorant (in another embodiment, no colorant) resin. The aforementioned color-containing resin may be a masterbatch formed through a conventional production process. The weight percentage of the colorant resin-containing colorant in the colorant-containing resin 12wt%, or 8wt%, the type can refer to the relevant paragraphs mentioned above.

In the conjugate fiber provided by the embodiment, the hydroxyl group of the ethylene-vinyl alcohol copolymer (EVOH) of the fiber surface layer is acetalized without using a dialdehyde compound through a post-treatment method. In contrast, the disclosed embodiment is formed first. The modified thermoplastic polymer is crosslinked and then composite melt-spun with the resin to form a composite fiber. The cross-linked modified thermoplastic polymer between the two materials of the formed composite fiber improves the interfacial separation phenomenon of the conventional composite fiber. The composite fiber provided by the embodiment has a dark color, a good feel and a good appearance of the finished fabric, and has good moisture wicking property.

The composite fibers and characteristics thereof provided by the present disclosure are illustrated by the following examples and comparative examples:

Preparation Examples 1 to 4: Crosslinking modified granulation (with a tripropylene acrylate compound as a crosslinking agent)

First, a cross-linking agent, isocyanurate (TAIC), an ethylene-vinyl alcohol copolymer (EVOH) (44% ethylene molar percentage), and a dispersing agent were mixed to obtain a mixture. Next, a crosslinking initiator dicumyl peroxide was added to the above mixture, followed by kneading. The mixing time is about 10 minutes, and the mixing temperature is about 200 to 230 °C. Thereafter, the kneaded product was subjected to stranding and pelletizing to obtain the crosslinked modified EVOH pellet of Preparation Example 1.

Preparations 2 to 4 were prepared in the same manner as in Preparation Example 1, except that the composition ratios of triallyl isocyanurate (TAIC) and ethylene-vinyl alcohol copolymer (EVOH) were adjusted as shown in Table 1. . In Preparation Examples 1 to 4, the addition ratio of the dispersant was 0.5% by weight. In Preparation Examples 1 to 4, the crosslinking initiator dicumyl peroxide was added in an amount of 0.05% by weight, based on the total weight of the crosslinking agent, the ethylene-vinyl alcohol copolymer (EVOH), and the dispersing agent. Benchmark.

The polymer undergoes a cross-linking reaction to produce a colloid which is insoluble in the solvent. The colloidal particle size in the product obtained by the mixing in Preparation Examples 1 to 4 was measured by a laser caliper, and the measurement results are shown in Table 1.

Preparation Example 5: Crosslinked modified granulation (with a tripropylene amide compound as a crosslinking agent)

Preparation 5 was prepared in the same manner as in Preparation 1, except that triallyl isocyanurate (TAIC) was replaced with triallyl amine. The colloidal particle size in the product obtained by the kneading in Preparation Example 5 was measured by a laser caliper, and the average particle diameter was measured to be 45 nm.

Comparative Example 1: Composite fiber--- uncrosslinked modified EVOH (P-EVOH)/PET

An uncrosslinked modified EVOH particle (hereinafter referred to as P-EVOH) having a vinyl ether percentage of 44% is used as a sheath component material of the composite fiber, and polyethylene terephthalate (PET) is used. The particles (intrinsic viscosity (IV) value: 0.64) are used as the core material of the composite fiber, and the above two materials are subjected to composite melt spinning. First, after winding at 2,800 m/min, it was further extended at 80 ° C and fixed at 150 ° C to form a fully extended yarn (FOY). So far, the manufacture of the composite fiber has been completed. The obtained composite fiber specifications were: Danny 80D/36F, strength 2.8 (g/d), and elongation 25 ± 5 (%).

Example 1: Composite fiber--- crosslinked modified EVOH (M-EVOH)/PET

The crosslinked modified EVOH particles (hereinafter abbreviated as M-EVOH) having a percentage of ethylene molar of 44% in Preparation Example 2 were used as a sheath component material of the composite fiber, and polyethylene terephthalate (PET) particles were used. (IV value: 0.64) As a core material of the composite fiber, the above two materials were subjected to composite melt spinning. First, after winding at 2,800 m/min, it was further extended at 80 ° C and fixed at 150 ° C to form a fully extended yarn (FOY). So far, the manufacture of the composite fiber has been completed. The obtained composite fiber specifications were: Danny 80D/36F, strength 3.2 (g/d), and elongation 25 ± 5 (%).

Figures 3A to 3B show cross-sectional scanning electron micrographs of the composite fibers obtained in Comparative Example 1 at different magnifications. It can be seen that the P-EVOH/PET sheath core interface separation phenomenon of Comparative Example 1 is remarkable. In contrast, Figures 4A to 4B show cross-sectional scanning electron micrographs of the composite fibers obtained in Example 1 at different magnifications, and it can be seen that the M-EVOH/PET sheath core of Example 1 is The interface became inconspicuous, and the interface separation phenomenon between the sheath cores was significantly improved as compared with Comparative Example 1.

Example 2: Composite fiber --- M-EVOH/PA

In Preparation Example 5 (crosslinking agent is a trisacrylamide compound), M-EVOH having a percentage of vinyl mole of 44% is used as a sheath component material of the composite fiber, and is a polyamide resin (Taiwan; Sunylon 2NBR Nylon 6) particles (RV value: 2.4) are used as the core material of the composite fiber, and the above two materials are compound melt-spun. First, after winding at 3,800 m/min, the film was further extended at 50 ° C and fixed at 150 ° C to form a full-length yarn (FOY) to complete the production of the composite fiber. The obtained composite fiber specifications were: Danny 80D/36F, strength 3.5 (g/d), and elongation 25 ± 5 (%).

Example 3: Composite fiber --- M-EVOH / color containing material PBT

M-EVOH having a percentage of ethylene molar of 44% in Preparation Example 2 was used as a sheath component material of the composite fiber, and a polybutylene terephthalate containing 0.025% by weight of a light purple toner (Dagong Chemical; PV 23) Polybutylene terephthalate (PBT) particles (IV value: 0.9) are used as the core material of the composite fiber, and the above two materials are compound melt-spun. First, after being wound into a partially stretched yarn (POY) at 2,800 m/min, it was further extended at 70 ° C and shaped into a full stretched yarn (FOY) at 150 ° C. So far, the manufacture of the composite fiber has been completed.

Examples 4 to 6: Composite fiber --- M-EVOH / coloring material PBT

Examples 4 to 6 were prepared in the same manner as in Example 3 except that in Example 4, the pale purple toner was replaced with a light green toner (Dagong Chemical; PG-7), and in Example 5, the light purple toner was used. Replaced with orange toner (Tai Kung Chemical; PO-16), in Example 6, the light purple toner was replaced with yellow toner (Da Kung Chemical; PY3).

The specifications of the partially stretched silk (POY) composite fibers obtained in the above Examples 3 to 6 are shown in Table 2, and the specifications of the fully expanded yarn (FOY) composite fibers obtained in the above Examples 3 to 6 are shown in Table 3.

The appearance of the colored composite fibers obtained in Examples 3 to 6 was observed, and the cross-sectional images thereof were observed by a scanning electron microscope, as shown in Figs. It can be found that the colored composite fibers obtained in Examples 3 to 6 are well formed, and the interface between the M-EVOH/PBT sheath cores is not conspicuous, and the interface separation phenomenon between the sheath cores is remarkably improved as compared with Comparative Example 1.

Example 7: Composite fiber --- M-EVOH / coloring material PA

In the preparation example 5 (crosslinking agent is a tripropenylamine compound), M-EVOH having a percentage of vinyl mole of 44% is used as a sheath component material of the composite fiber, and contains 0.025% by weight of blue powder (Da Gong Chemical; PB-15) Polyamide resin (Taiwan; N6) particles (RV value: 2.4) as a core material of the composite fiber, the above two materials are compound melt-spun. First, by After 3800 m/min was wound into a partially stretched yarn (POY), it was further extended at 50 ° C and shaped into a full stretch yarn (FOY) at 150 ° C. So far, the manufacture of the composite fiber has been completed. The obtained composite fiber specifications were: Danny 80D/36F, strength 3.4 (g/d), and elongation 25 ± 5 (%). The appearance of the colored composite fiber obtained in Example 7 was observed, and the cross-sectional image thereof was observed by a scanning electron microscope as shown in Fig. 9. It can be seen that the colored composite fiber obtained in Example 9 is well formed, and the interface between the M-EVOH/PA sheath core is not conspicuous, and the interface separation phenomenon between the sheath cores is remarkably improved as compared with Comparative Example 1.

From the results of the above examples, it can be confirmed that the cross-linking phenomenon of the thermoplastic polymer is cross-linked and modified, and the composite fiber formed by the composite melt-spinning of the cross-linked modified thermoplastic polymer and the resin is obtained. Improved, good fiber formation, and good physical properties such as spinnability and elongation. In addition, the composite fiber formed by the coloring resin and the crosslinked modified thermoplastic polymer used in the present disclosure can obtain a dark fiber, a finished cloth, and a good appearance, and has good moisture wicking property.

The disclosure has been disclosed in the above several embodiments, but it is not intended to limit the disclosure, and any person skilled in the art can make any changes and refinements without departing from the spirit and scope of the disclosure. Therefore, the scope of protection of this disclosure is subject to the definition of the scope of the patent application.

Claims (20)

A composite fiber comprising: a first region, the composition of the first region comprising a resin; and a second region, the component of the second region comprising a crosslinked thermoplastic polymer, wherein the composition of the second region Forming from 96 to 99.79 wt% of the thermoplastic polymer, 0.1 to 1.5 wt% of a crosslinking agent, 0.1 to 1.5 wt% of a dispersing agent, and 0.01 to 1 wt% of a crosslinking initiator; wherein the crosslinking The thermoplastic polymer includes colloidal particles having an average particle diameter of not more than 1000 nm, wherein the first region and the second region are linked by a van der Waals force generated between the first region and the second region through a functional group each having a functional group . The conjugate fiber of claim 1, wherein the component of the first region further comprises a colorant. The composite fiber according to claim 2, wherein the color percentage of the colorant in the first region is 12wt%. The conjugate fiber according to claim 1, wherein the resin comprises: a polyester resin, a polyamide resin, a polyolefin resin, or a copolymer of the foregoing various resins. Things. The conjugate fiber according to claim 1, wherein the thermoplastic polymer is an ethylene-vinyl alcohol copolymer (EVOH), and the ethylene-vinyl alcohol copolymer has a vinyl mole percentage of 25 to 50%. The conjugate fiber according to claim 1, wherein the crosslinking agent is a tripropylene acrylate compound, a tripropylene amide compound, or a combination thereof. The conjugate fiber according to claim 6, wherein the tripropenyl ester compound comprises triallyl isocynaurate (TAIC), triallyl cyanurate; TAC), triallyl trimesate (TAM), or a combination of the foregoing, the tripropyleneamine compound including triallyl amine, triallyl-ammonium cyanurate, or the foregoing The combination. The conjugate fiber of claim 1, wherein the dispersing agent comprises a C _15-38 alkane, a C _15-38 ester, or a mixture of the foregoing. The conjugate fiber according to claim 1, wherein the crosslinking initiator comprises benzoyl peroxide, dicumyl peroxide, azobisisobutyronitrile, Or a combination of the foregoing. The composite fiber according to claim 1, wherein the composition of the second region has a shearing force (melt viscosity (η) × shear rate) of 120 to 20 Pa at 190 to 220 ° C. s × 4000 ~ 12000s ^-1 . The composite fiber according to claim 1, wherein in the cross section of the composite fiber, an area ratio of the first region to the second region is 10:90 to 90:10. The composite fiber of claim 1, wherein at least a portion of the second region of the composite fiber is located at a periphery of the cross section. The composite fiber according to claim 11, wherein in the cross section of the composite fiber, the first region is a core portion, and the second region is a sheath portion. A method for producing a composite fiber comprising: mixing 96 to 99.79 wt% of a thermoplastic polymer, 0.1 to 1.5 wt% of a crosslinking agent, and 0.1 to 1.5 wt% of a dispersing agent to form a mixture; adding 0.01 to 1 wt% of the mixture Coordinating the initiator into the mixture and kneading to form a crosslinked thermoplastic polymer; subjecting the crosslinked thermoplastic polymer to stranding and pelletizing to form a crosslinked modified particle; and modifying the crosslinking The particles are subjected to compound melt spinning with a resin. The method for producing a conjugate fiber according to claim 14, wherein the thermoplastic polymer is an ethylene-vinyl alcohol copolymer (EVOH), and the ethylene-vinyl alcohol copolymer has a vinyl mole percentage of 25 to 50%. . The method for producing a conjugate fiber according to claim 14, wherein the crosslinking agent comprises a tripropylene acrylate compound, a tripropylene amide compound, or a combination thereof. The method for producing a conjugate fiber according to claim 16, wherein the tripropenyl ester compound comprises triallyl isocynaurate (TAIC), triallyl cyanurate ( Triallyl cyanurate; TAC), triallyl trimesate (TAM), or a combination thereof, including trilylamine, triallyl-ammoniumcyanurate Or a combination of the foregoing. The method for producing a conjugate fiber according to claim 14, wherein the kneading time is 1 to 10 minutes, and the kneading temperature is 170 to 230 °C. The method for producing a conjugate fiber according to claim 14, wherein the kneading is carried out using a twin-screw kneader. The method for producing a conjugate fiber according to claim 19, wherein a screw rotation speed is 200 to 300 rpm.